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TIL After water, concrete is the most widely used substance on Earth. If the cement industry were a country, it would be the third largest carbon dioxide emitter in the world with up to 2.8bn tonnes, surpassed only by China and the US. [2018 numbers]

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via reddit.com

rN1Be TIL in 1985, David Lewis Rice tortured Charles Goldmark to get a list of "Communist operatives" and then murdered the entire Goldmark family, acting on rumors he heard accusing Goldmark's father John to have been a Jewish Communist agent
KVnw TIL in 1996, future pop singer James Blunt, then a British Army Officer deployed to Kosovo, was ordered by the NATO Supreme Allied Commander to forcibly take an airport occupied by Russian troops, but he refused, saying he was, “not going to start the Third World War.”
yQBBM TIL about history's most expensive "hyphen" when a NASA programmer missed out a single hyphen whilst transcribing a mathematical formula for the guidance system which caused an entire NASA rocket launch to be aborted and the rocket destroyed.
b9w7Z TIL during the Depression, Frederick Mellinger, was fired from a job for proposing they sell black women's underwear instead of the basic white. He then joined the Army and found that men wanted to see pin-up girls in more risque lingerie. This caused him to make his own exotic line of lingerie.
mGDM TIL that with 21 probable onscreen deaths and 15 mentioned deaths, Pixar’s The Incredibles has a higher body count than Die Hard 1